I had been using firefox excusively, but found that pages that had lots of flash like (
Sydney Morning Herald - Business & World News Australia | smh.com.au) just freeze for ages and task mgr shows them using 100% cpu time. This was really killing my machine and short of disabling flash, I was stuffed.
So, I have started using Chrome full time, and must say I'm enjoying it - certainly not the hangs that firefox was having...